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J. P. TIRRELL ELECTROMAGNETIC ENGINE.

Patented May 31 1870.

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moon PORTER. TIRRELL, or OHARLESTOWN, AssIcNoR' T0 HENRY A,

CLARK. or BOSTON, MASSACHUSETTS.

Lawrence: No. 103,798, dated May 31, 1870.

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The Schedule referred to in than Letters Plum and making part of the some To all persons' to whomtlwse presents shall come:

'lBe-it known that I, JACOB Pon'rnn Trnnnnn, of

Charlestown, in'the county of Middlesex and State of Massachusetts, have invented certain new and use:

ful Improvements in Electro-Motors, and that the following is a full and exact description of the same, reference being bad to the accompanying plate of drawing. v The electric motor embraced by the present inven tion consists of a combination of two or more sets of eleotro-magnets, and an armaturefor every set, which armatures are so disposed and'arranged in connection with a shaft, constructed to establish and break circuits through the magnets, as to produce, through the attraction of the armatures by the magnets, a continuous rotary movement to said shaft, and with'a uniform force at all points of its rotation.

In the accompanying plate of drawings my improvements in eleotrc-motors are illustrated- Figure 1 being a plan view of an electro-motor, constrt-ucted and arranged according thereto;v

Figure 2, aside-elevation; and

Figures 3 and 4, views-in detail.

A, in the 'drawing ireprescnts abase or foundationplate.

B, B, B, and B electro-maguets, arranged in two rows, with the magnets B B in one row, and the magnets B B in the other.

.The several electro-magnets in the two rows are set on an inclination, from end to end, with aspace, 0, between.

D D, two armatures', hung at their lower edge, by pivot joints a, to standards or bearings E, between the inner and opposite ends of the electromagnets, the one armature, D, for the set of mag-- igti, B B, and the other, 1), for the set of magnets The square and inner ends of the magnets are in lines parallel to theradii of circles described by the armatures in turning on their pivot joints,

Each armature, by its upright arm E, is connected,

through a pitmau or connecting-rod, F, one for each arm E, to a separate disk or crank, G, of a common horizontal shaft, H, hung between parallel posts or upgights, I turningin bearings thereof. v,

- ith the shaft H, at'Aythrough a spring-piece current-breaker, K, bearing thereon, connection is made, by a suitable wire,-f, with one pole of an electrio battery.

'The opposite poles of the several electro-magnets are, by .wires, connected to spring-pieces, currentbrcaksrs' L L, and M M, that is, the magnets B to I the breaker L, the magnets B to the breaker L, the

magnets B to the breaker M, and the magnets 13 to the breaker M", the said several breakers being arranged to bear. on the shaft H at the pointsN and 0, respectively.

-'At the points N and O of the shaft, the shaft around' its periphery is divided into spaces 7) and c, b being conductors and c nonconductors, the one, I), establishing circuits and the other, 0, breaking'them, according as the breakers are on one or the other of the spaces 1) and 0. hus it will be obvious that when the breakers L L M and M", the one'after the other, are in com tact with the conducting spaces b-of the shaft H, the circuit through the magnet connected with that breaker, then in contact, is established, producing an attraction by the saidmagnet of the armature located in position therefor, but that, with a breaker in contact with a non-conducting space, 0, of the shaft, the circuit through its magnet is broken.v

The relative arrangement of the spaces 7) and c on the shaft is such that, in the turning of the shaft, the

electric current will be'seut alternately through the several magnets, that is, for instance, through the magnet B, then the magnet B", then the magnet 13, and, lastly, the magnet-B; when, through the first cited magnet, the current is again thrown, and so on,

as before; and the adjustment of said spaces and breakers is such that,just lielore the operation of the circuit through one magnet is completed, it will be established through the next magnet, and so on through the series, the circuits being thus alternately establish-ed and broken through the series of magnets.

B'y'the attraction of the magnets upon the armatln'es, through the pitman-rod, with its crank connection to the shaft, a continuous rotary movement of the shaft is produced, and by the combination and arrangement of the magnets and pitman and shaft connections described, there is no retarding of the -'shafts motion in passing the dead points of the cranks, from the fact that, when the one crank is at the dead point the other is at the most cfiective position for leverage to, turn the shaft, the necessary magnet, at such time, being in circuit to then operate; and it may be here remarked that, in lieu of using four magnets, as described, less or more might be employed, but four produce satisfactory results; and it may be also remarked that, in arranging the magnets, armatures, and connecting devices between the 'armatures and shaft, it is bcst that the armatures, in their movement, should be restrained from impin'ging directly against the magnets.

Having-thus described my invention,

What I claim and desire to secure by Letters Patent, is-

l. The sets of magnets placed on an inclination, so that their inner ends are in line'parallel to the radii of circles described by the armatures in turning on the axis, substantially as described.

2. The double cranks, in combination with the armaturs D D, oscillating in the spaces formed'by the series of magneis, substantizilly'as and for the purpose described.

The above specification of my invention signed 'by me this 9th day of May, A. D. 1870.

Witnesses EDWIN W. BROWN, ALBERT W. BROWN J. 1. TIRRELL. 

